Machine to remove carpet? What for? Cut it and pull it up.
I agree with the other advice you have received, including the ice
scraper in some cases. Often you don't even need that.

It is really GLUED down and it would take me weeks to get that sucker
up. I've tried in a few places to see how glued down it was and it
quite the struggle just to lift up a tiny bit of it. The machine
apparently will do it in 1/2 a day. Seems good to me!